proposed-migration for astropy 6.0.0-1ubuntu1

[Steve Langasek]

astropy 6.0.0-1ubuntu1 has autopkgtest failures on armhf:

939s def test_distortion_header(tmp_path):
939s """
939s Test that plate distortion model is correctly described by `wcs.to_header()`
939s and preserved when creating a Cutout2D from the image, writing it to FITS,
939s and reading it back from the file.
939s """
939s path = get_pkg_data_filename("data/dss.14.29.56-62.41.05.fits.gz")
939s cen = np.array((50, 50))
939s siz = np.array((20, 20))
939s
939s if PYTEST_LT_8_0:
939s ctx = nullcontext()
939s else:
939s ctx = pytest.raises(VerifyWarning)
939s
939s with fits.open(path) as hdulist:
939s > with ctx, pytest.warns(wcs.FITSFixedWarning):
939s E Failed: DID NOT RAISE <class 'astropy.io.fits.verify.VerifyWarning'>
939s
939s /usr/lib/python3/dist-packages/astropy/wcs/tests/test_wcs.py:1749: Failed

It is not obvious why this would be specific to armhf, but arm64 passed.